Author: Brian Richardson
Date: 15:28:32 05/02/02
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On May 02, 2002 at 12:13:44, Uri Blass wrote: >On May 02, 2002 at 12:01:25, Brian Richardson wrote: > >>On May 02, 2002 at 11:40:57, Robert Hyatt wrote: >>> >>>This isn't a "king safety" position. It is a pure tactical position: >> >>It might be king safety related. Tinker also finds Nxh5 in about the same time >>on my laptop as Crafty does. However, when using only material and piece square >>tables in a "fast eval" mode, Tinker does not find the move after a couple of >>minutes. Gerbil (v1 and v2) does not find it either. So, an eval with king >>safety terms is a factor (Gerbil v2 has some, but not enough I guess). > >I think that the only reason that you do not find it with piece square table >evaluation is the fact that you have not the right extensions. No, Tinker uses the same extensions with both the normal eval and the material/pcsq tables only eval functions. Normal eval takes 6 seconds to pick Nxh5+ at 8 ply, but needs until 2:30 and 10 ply to see the big score increase. Material/pcsq only eval takes 4:48 to pick the move and 8:21 to resolve the score. > >A jump in the score of crafty from +0.19 to +3.10 and later to 4.34 cannot be >because of king safety evaluation because crafty is not so speculative. > >Uri
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